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Imported Upstream version 4.8.0.309

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Former-commit-id: 5f9c6ae75f295e057a7d2971f3a6df4656fa8850
This commit is contained in:
Xamarin Public Jenkins (auto-signing)
2016-11-10 13:04:39 +00:00
parent ee1447783b
commit 94b2861243
4912 changed files with 390737 additions and 49310 deletions
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15
mcs/class/referencesource/System.Configuration/System/Configuration/ClientConfigPaths.cs
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@ -26,6 +26,8 @@ namespace System.Configuration {
const string ClickOnceDataDirectory = "DataDirectory";
const string ConfigExtension = ".config";
const int MAX_PATH = 260;
const int MAX_UNICODESTRING_LEN = short.MaxValue;
const int ERROR_INSUFFICIENT_BUFFER = 122; //https://msdn.microsoft.com/en-us/library/windows/desktop/ms681382(v=vs.85).aspx
const int MAX_LENGTH_TO_USE = 25;
const string FILE_URI_LOCAL = "file:///";
const string FILE_URI_UNC = "file://";
@ -108,7 +110,18 @@ namespace System.Configuration {
}
else {
StringBuilder sb = new StringBuilder(MAX_PATH);
UnsafeNativeMethods.GetModuleFileName(new HandleRef(null, IntPtr.Zero), sb, sb.Capacity);
int noOfTimes = 1;
int length = 0;
// Iterating by allocating chunk of memory each time we find the length is not sufficient.
// Performance should not be an issue for current MAX_PATH length due to this change.
while (((length = UnsafeNativeMethods.GetModuleFileName(new HandleRef(null, IntPtr.Zero), sb, sb.Capacity)) == sb.Capacity)
&& Marshal.GetLastWin32Error() == ERROR_INSUFFICIENT_BUFFER
&& sb.Capacity < MAX_UNICODESTRING_LEN) {
noOfTimes += 2; // increasing buffer size by 520 in each iteration - perf.
int capacity = noOfTimes * MAX_PATH < MAX_UNICODESTRING_LEN ? noOfTimes * MAX_PATH : MAX_UNICODESTRING_LEN;
sb.EnsureCapacity(capacity);
}
sb.Length = length;
applicationUri = Path.GetFullPath(sb.ToString());
applicationFilename = applicationUri;
}